Remove vdr_add_local_patch() and use epatch_user() from eutils instead. Issue a error in case the old variable to pass user patches is still used. Also the example has been removed as it was actually a common ebuild example, nothing specific. Update descriptions.

More cleanups of VDRDIR handling. Added VDRINCDIR variable for more easy patching. Added large description for this. Pass TMPDIR and LIBDIR only via make parameters. Now install header-checksums for all installed plugins.

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